An air-spaced zero-order waveplate consists of two quartz plates mounted in a holder to form an air gap, with their optical axes orthogonal to each other. The thickness difference between the two quartz plates enables zero-order phase retardation. Zero-order waveplates are insensitive to temperature and wavelength variations. An optically contacted zero-order waveplate is composed of two quartz plates bonded via optical contact, with their optical axes orthogonal. The thickness difference between the two quartz plates achieves zero-order phase retardation. Zero-order waveplates exhibit insensitivity to temperature and wavelength changes. A cemented zero-order waveplate is formed by bonding two quartz plates with UV glue, featuring orthogonal optical axes. The thickness difference between the two quartz plates generates zero-order phase retardation. Zero-order waveplates are not sensitive to temperature and wavelength fluctuations.